MIL-DTL-12883/2E
mm
Inches
mm
Inches
mm
Inches
mm
Inches
mm
Inches
22.86
.900
.438
11.13
3.18
.125
1.09
.043
0.05
.002
28.58
1.125
15.75
.620
3.96
.156
1.19
.047
0.13
.005
30.18
1.188
15.88
.625
4.78
.188
1.57
.062
0.25
.010
20.32
.800
9.07
.357
2.39
.094
0.36
.014
22.22
.875
9.52
.375
2.77
.109
0.79
.031
NOTES:
1. Dimensions are in inches.
2. Metric equivalents are given for general information only.
3. Unless otherwise specified, tolerance is + .016 inch (0.41 mm) and + ½º on angles.
4. Seven contact cavities equally spaced through 270º of arc, and each cavity located within ½º of true
position shall be established along the pin circle.
5. Each contact tab shall have either:
a. 1 wire hole of .040 inch (1.02 mm) minimum width and .125 inch (3.18 mm) minimum length.
b. Two holes of .040 inch (1.02 mm) minimum width and .075 inch (1.91 mm) minimum length.
The contact tab hole, or holes shall lie on the longitudinal centerline of the contact tab within + .008
inch (0.20 mm).
6. An orientation slot or tongue, or other suitable means to serve as a guide for proper positioning of
all applicable electron tube in the socket contacts, shall be placed on the shield, mounting between
contacts 1 and 7.
7. The design of bosses and the shape of barriers, when used, are optional. When present, barriers
shall have a maximum height of .062 inch (1.57 mm).
8. Clearance between the cavity wall and the contact, with the contact in any position, shall be no
greater then .018 inch (0.46 mm).
9. Material thickness of mounting flange shall be measured in an area where burring or dishing of the
mounting hole is not present.
FIGURE 1. Socket configuration Continued.
REQUIREMENTS:
Dimensions and configurations: See figure 1 and table I.
Insulating material: Ceramic, Diallyl Ortho-Phthalate in accordance with ASTM PS 15 type, SDG-F,
GDI-30F, or mineral-filled Phenolic resin in accordance with ASTM D5948 type MFE, see table I.
Contact cavities: One shape only; D-shaped or circular, at option of the manufacturer.
Electrical:
Insulation resistance: 1,000 megohms minimum. Test pin diameter: .040 + .001 inch
(1.02 + .03 mm).
2
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